function startTime() 
{ 
var today=new Date(); 
var h=today.getHours(); 
var m=today.getMinutes(); 
var s=today.getSeconds(); 
// add a zero in front of numbers<10 
m=checkTime(m); 
s=checkTime(s); 
document.getElementById('txt').innerHTML=h+":"+m+":"+s; 
t=setTimeout('startTime()',500); 
} 

function checkTime(i) 
{ 
if (i<10) 
{ 
i="0" + i; 
} 
return i; 
} 
